Large fragmentation of the pairing-vibration⊗particle strength inSm145

The two-neutron transfer reaction $^{147}\mathrm{Sm}$(p,t${)}^{145}$Sm was studied at ${\mathit{E}}_{\mathit{p}}$=26 MeV. Angular distributions were measured for ${\mathrm{\ensuremath{\theta}}}_{\mathrm{lab}}$=5\ifmmode^\circ\else\textdegree\fi{}--50\ifmmode^\circ\else\textdegree\fi{}. The strength of the two neutron monopole pairing phonon\ensuremath{\bigotimes}particle configuration (${\mathit{n}}_{\mathrm{\ensuremath{-}}}$=1,${\mathit{n}}_{+}$=1)\ensuremath{\bigotimes}\ensuremath{\nu}2${\mathit{f}}_{7/2}$ is identified in odd mass $^{145}\mathrm{Sm}$ and is found to be quasi-uniformly spread in two narrow groups of as many as 8+5=13 states. This unexpected large fragmentation is compared with the one in the core nucleus $^{144}\mathrm{Sm}$ and with that from its isotone $^{143}\mathrm{Nd}$ where the monopole pairing vibration is less fragmented. The couplings with other excitation modes are extracted.